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How to sort a dataframe by multiple column(s)
...orting to add-on tools -- see this simpler answer which uses a trick right from the top of the example(order) code:
R> dd[with(dd, order(-z, b)), ]
b x y z
4 Low C 9 2
2 Med D 3 1
1 Hi A 8 1
3 Hi A 9 1
Edit some 2+ years later: It was just asked how to do this by column index. The answe...
What and where are the stack and heap?
.... This makes it really simple to keep track of the stack; freeing a block from the stack is nothing more than adjusting one pointer.
The heap is memory set aside for dynamic allocation. Unlike the stack, there's no enforced pattern to the allocation and deallocation of blocks from the heap; you c...
How do you manage databases in development, test, and production?
...roduction database into an appropriate environment and run all the scripts from source control on it, which will update the database to the current version. We do this on a daily basis to make sure all the scripts run correctly.
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Get protocol + host name from URL
In my Django app, I need to get the host name from the referrer in request.META.get('HTTP_REFERER') along with its protocol so that from URLs like:
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How to prevent a background process from being stopped after closing SSH client in Linux
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I would recommend using GNU Screen. It allows you to disconnect from the server while all of your processes continue to run. I don't know how I lived without it before I knew it existed.
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SAML: Why is the certificate within the Signature?
...verification of the signature. Here is the signature part of a sample SAML from our partner company (asserting party):
3 An...
Java: Get month Integer from Date
How do I get the month as an integer from a Date object ( java.util.Date )?
7 Answers
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pull/push from multiple remote locations
The short: is there a way to have a git repo push to and pull from a list of remote repos (rather than a single "origin")?
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Is an HTTPS query string secure?
...ough I need to note that RFC states that browser should not send referrers from HTTPS to HTTP. But that doesn't mean a bad 3rd party browser toolbar or an external image/flash from an HTTPS site won't leak it.
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Undo a merge by pull request?
...d that it merged in a bunch of commits. So now there are all these commits from this person from days before the merge. How do you undo this?
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